You do NOT have to feed mice/rats to your frog! Even if you wanted to it's recommended you only feed mice to them around once every 2+ weeks, as they are high in fat. Crickets and Roaches are good options, but a lot of people on this forum like worms, nightcrawler especially as their staple food source for pacman frogs. Worms can also be dusted in vitamins/calcium pretty easily. Nightcrawler are lower in fat than most other worm types. I hope this helps!